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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '24e3b383280786569d2871463fb21c0a24ad5ee4689197c4d2ecee07363a4f99' 
  AND token = 'Wt7RC+X4OwHowRQ+SX4ar1vf0n7boqdCxuSPJc0xdOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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