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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4230bad58c71aba58744aed5fa28180457daed92f6fbf93a5ac2538a83bdb50f' 
  AND token = 'I6tOHBGNIrdQ/Ijx0ZIvuxfvZ/al0NOwCvoJ++9c+MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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