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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '609c6309f9b255806b438c89de3200be5bec63661ecdbe09df1bbe32ea9bcd84' 
  AND token = 'TX5E562AHFWuZMtuTHEXOmrMXXYC5JI0dF0A8m6I8Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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