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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '22c4c085555bbfa5ef4074dcf84fd8e64cae95a9df987d064fad2dff99df7c07' 
  AND token = '+Wu5K3J5Ov8xX42o0eU2I0LftMVGaC6ioeQACA0QGn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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