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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '467a84f561cd19fae3ee2f1b4e617f87b912ffaeaf1b585b25aa323a931fa12b' 
  AND token = 'dY6Pm6ADGMcMt+nkF7DpEpySjzKwDroYTaEGWHIasCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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