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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '80477d3e6375cc1c2d05d66c893fac33c43b06ba7331fba37554a49ba37e18ad' 
  AND token = 's8Y/9yzQ1L6VcgLz6KAdn/keCcEfogII5ch7ZFVzR98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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