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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '418d443e0b826658b37f23ebd0e7445c5046653b5a24049bca29557677c26093' 
  AND token = 'qpA3CFvIsXj9ON40BgcvVnIbcPt4UTRYVtceDVyvRUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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