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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '01f04b769975e2f3dcf0ce05e92eb3b0eeb3e29824267d356c7bf21265193ed3' 
  AND token = 'c2BnX3BKsAiSa5IcQiyAftSk5Xjy4lrPsuKaTJ6WgI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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