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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c89bec183154d878461df9226a11a0993dcf4aa829a5ba259b49ab74f707c6b0' 
  AND token = 'Mb4BZ4sDVBLhM1i7tADAesnhHv9Kd6OodobpUDdeqAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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