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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6c09ea568f0bc7a8778267afea33895f33907f9ef7a28ab53866aaf977fc1f9f' 
  AND token = 'xt28Ks5M3DA9piqPO9+U0gLMxrQOla+4wQ1hWVwpJ7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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