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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a497da83ebdb904bea0ccec1f973d90a639c19f340a298ed82a2099e162d90ef' 
  AND token = 'rpDK6v09oV/awxCu4OX3ICEN9HeO56RnhkCJlVPI574=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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