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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea944c9b5e4971843592d9ce89a0df452c3e8eb103fe8b0c1c6fa808f840581b' 
  AND token = 'AQSeUOyGzqLU+tT0vpdmlikcH5ed9OtdTgqfOoMEA2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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