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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '462ff8b55ad1e1b1648d28a79815ecbdabf2504c943d9da8b69b860523363bbf' 
  AND token = 'aptICJoje58q42sUfpt5UB/pFiB3TrkwP5RNAvHD+sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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