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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3663178cb9a2983263e0223400a0b75962d68266a4cd3aa108c94c774d7fedcb' 
  AND token = 'toN2pyp7smbkmXnZ3tkgKclUPJhIwKJ1aU3L7zf0Q2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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