Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb88dcbddd3f3f464bfd89976cbe9b1b2e201167195e57df60065baad471a61' 
  AND token = '3S/gwg+Ixhtie1/doWVAL8n7/RIRRZUeHTR0q65zK7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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