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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '87ec02a8e90b193a12b327ab95a753efec1ae3c85c50f387f4cbd0e4cadebfb5' 
  AND token = '7u6koCSpxb76MLLFLR84t3uKxp1mbYHLuw3XUztZbw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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