SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e45cfc63ae40c3e832ce3661f30d6ba4b8d7b8cd6c71c7908761b8c5ce7e7257' 
  AND token = 'GmvwvRirNtmxGBkHwEyC9qecYz3urBNtREUH+QOP8Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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