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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '97ab77dc5838bd31456491b7b6c8c0db1647366bd1c7c078aa27e42ff5531324' 
  AND token = '0nzlh+MFctPai/CwkpHXgdRJNWdPTNc849e0EiX6lb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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