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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'af1d271405dc05195f27bfc5033c7d1ab389336d10935cd029838391299e3eda' 
  AND token = 'enuuSZoZgWg1lVzLVo8BiPKt6obDLc0UMcIFl5dvFgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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