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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '11b2a7fb8e3af5fa734322fbf9f4d4c51cfcee80a2fa8b638f53f19a951ba768' 
  AND token = 'UTTaIvKcboaLgvbto3syFe2tGVcam1vOx9voc1ZxBnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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