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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '213418f2c4e1cebbea827b9b05b4f7a8c028ba5cb7f47b6d4503804411a7573f' 
  AND token = '7WFjL6hZ1gni0NwijgGRif7Uo6ABpKrrcCy6h1vnmtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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