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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fb12f6e9c9dacd7f48e1c14cdc66da6c7c18403846d750cb227502d9db532e8d' 
  AND token = 'OP7el4ILWW5yOiJZ7elbF4Jz0/mzvmPK17UOWrrP5KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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