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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '351f03ef5a2cc40399614db6a5997e03a45d53429e94c9ce20742bc4bf2b6e24' 
  AND token = '9BD3Cav8cxTN9+7aXLopwG2Io0fKHI1hjPFLEXhvRSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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