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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '62a40ceadbeac4cb2bbd3c9cf6fda424732b36d3eb5a2f71d65d0abe566643a9' 
  AND token = '9UE0zxHRTM5TFPM7ufKQ5+i7fBlRs+RxIpyExvq2dOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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