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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '69678cea10f4cd37966f4b09c16a7cfdb4a25e7688f399038ff14fca3842027e' 
  AND token = 'c8zMrQoFLcSCGkVFqm6XKOyYUnLA4knD9Ksss5UqRaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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