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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3f4190a1946442de191434060a7bab827a940fac3075b6ac109da8153f5de3ff' 
  AND token = 'RXHRWI9NAa74zfJjEuNZU8XoxXM3ePgDJcQLh1O1LCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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