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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e0afbb6707037f6c6975f559e1e7b9232121c57cf3cb0d5d240163503bdf07a9' 
  AND token = '/PntCFY59QHR9Q5+rWnLM9Wl5Q9gpzi8AZagMJHfw5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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