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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '31cd3f16029a6724d67c83e62c4a9f90ad0e6bda263e3899bcebaa3296118636' 
  AND token = 'Zsb9qwuQqq7Mvec5vNYAch3kkiATT6X02+mDhnllyIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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