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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '469d8d1f94f08b4d015da094d2c21f37b92f7e89e6f5dff457aaaaeb28552d4b' 
  AND token = 'xuSmQi1sStk4g09QSpC4Yp8Ec+2yHfgPaZf2KeQ8Eik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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