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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd2a34e6c13de9d8b07762571f0187f821399ee3f9d34832e2ece8f99026c87f' 
  AND token = 'LE9lYuGsxMjut8PdAvvLWno1rqzjN77q08NOMEBExoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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