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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e48fd07e2c0b10bf0162cfebaa13401e5a1da19d2314e1e9485053e570c34e3d' 
  AND token = 'AMbxm9+GNb9mp5oeWIpIiWB1EN+jdY6tBwSJc9g6xNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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