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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '79d6d797f2f926d27c7d29b295bcd70539e6c17c56f47b9d374b40dde0505942' 
  AND token = '7FPOu4kWu8id/ajDXv1sBUxoZxacVFsKQkd209hnmLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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