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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '498ce8410d4d66cd704cf5172eab3ef2bc00474dd65d4110981726d5bd068f73' 
  AND token = '9mWLNTC4OutPxUD0VrKR9PYubNHSViMIR7UqfSHFHoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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