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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'df7ac2c4034221fda95ab2145ac0a7ed7b112aa73cd1a6a5d9f4982bfd734239' 
  AND token = 'URDzea2fMme1J9t/BUJ5SBJMqfRpC54CzjFioWIqM7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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