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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a3df38cab95430d5ac6e13dcf162a71d1c107adc5f9cfc2632f9aeb39ac6880b' 
  AND token = '3WEB5gOV+onkjaaHPGjZTiAS0WziQDocbpD1sAfCUC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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