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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2e9ac6513f29d21385b84ff8354b8be2ec9da8e693a4ed9d0dc2155e51f6a28e' 
  AND token = 'ckVBkjGvz7T83S3UhepekY8mZb0ecpklBdrW6XORwUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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