Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e9ce9c73b0ec3a6fd6355141a0271938debf9e1ce5b905dcd4dde8ba59c907' 
  AND token = 'FurBkR4ZtuPV+izzYi/p6OGx/jA56fdg2SHiZsyT6kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}