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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6002ede258bfcbe3a6b1d6f38ba74b410ff6e2b4a32a1dc6c9ae818170a8507b' 
  AND token = 'fU91RT2QQ5fnJ6Md3SV7PQwiRHMrsGFJwHjS0wn7uHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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