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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f1099884d28ffce1b70d1f44613bdb3bb10df83c7d4c35e69ad7482434e5755' 
  AND token = 'Bgr7Fv8fsIbam/2mCvFSoyCJVuvqvb48dW8v8e24Sfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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