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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '16d02333e422d0700ee0bec940bb6626baa2cf7340dcd1a702fa02c4d90aacfb' 
  AND token = 'sMmOM1D1NzThMq152R/FPpT2KEz8jJR8GOdakN15/p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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