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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6834d3d7c67eb8a34619f30c9e1e8a0b3946a7e9ce89c6ee3b1fac347e83d21f' 
  AND token = 'VSWhxNJY7W4aFUF4E4hbDsyTvF0k62bg4FGwwsDqdSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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