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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '15b6576bf07b33c94ed2b411ad4fbf1c1ab686d154ef9e230f3093f4bc6639f6' 
  AND token = 'l60R/t5qJ4FCEyAczHrM7N3WXMke6Q6IALI8RWgipA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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