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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bd3bee2ed36cb20a3cf445ffba18db007477846c390a04016640730d6032f328' 
  AND token = 'GLhTxpAvkEaBcR/hbIotpI0ARFntMhrJklA46owR+Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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