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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b2916e3c0ff5a222501e69e49dc56479c212c058901bb9911ebb2bf012949284' 
  AND token = 'vyQUAkblHDs7h5yL4QRp7DS10exCBmbXRL4bSwKkoK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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