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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8367d242ab95b2cda4119eeeeaf65d10ffb4804c3037c24a5f08c26caafba29c' 
  AND token = '0ZNhtzyd3rbBuf0OYrMROD1L0uutPq5rOt7RNTf+Kc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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