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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e2810fda9f0083d58731857a59e9a31bfd29a196f5211faf5417eeb4479eb484' 
  AND token = '8+e+KiuYbtgWFe/kfnbY0u9yVhP0IQXYHYB1hRXf4Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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