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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8f2fa89bbb78d2f95d283bef5a991de1d4ce5cf9bd8de0a9395d1d84f72992a5' 
  AND token = 'uV/IEgGKKcI253O7p6B3TFbxq/BtyTo3sy+tZzjmzrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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