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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a1933216656b52b2ce6acda14a5b8a4a5ec5068fb0f55ea3083204bb69ba2bc2' 
  AND token = 'bd87iLXKT9MUtF9J9CMxulYE/8bMEb+ZEqyHBAScdck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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