Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361cb87872cd618d1e260a1a76d29c2e64d4aa54bb5f9d9c001032992afa3bcb' 
  AND token = 'fBWr2iRrgrlsrzGt1dQKGp0xOCE4qDMvTg+90Goa1wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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