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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b9314ce16684b807b2f259dd7bbea299cf0fe98c59994721a2d82b425bd92d90' 
  AND token = 'ELQLowXwl0dQaBeHJYeEayk4tloltnyij1D9iJAfmps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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