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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd28869fc39b8583138a79372024d327056e80cdd7681e02b01f64a211a686c1' 
  AND token = 'ymaMpTduKiTUYEPdKrveb06t3QQVZ7pg9jvR3TYKXN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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