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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8738551efbf0f87a3cabc2d12b754bf0467ab9675b7960da9806b1270e031b49' 
  AND token = 'BbQCdzmMgIDxwxvg4mz4RDGaa/SWeERLFQbj25Fb8kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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