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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6077620099102e9ca5096f1f7b2b928f38d9240983096452f13ffd7e60319794' 
  AND token = 'k5rpDvfO+lBtU0WRhScrx7NUodRrKBLss2ypxmUqFo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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