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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e82c89a183ad19ebf8354e62b6bfbd403e9cbb0cbbaaac38f2a5856b53849c89' 
  AND token = 'MAA+u4w4gERl0eeFVnhIgH5+jes299djtx7KOWKVxnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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