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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a1f288d3a79b37e17506d76b91c3c461e0c1fb3e4b769a5373691b7c957a8846' 
  AND token = 'dwkyAYm8nCC2iJW+iNDU3jmrxwgYn7LuC+oMHoDMd+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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