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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '546a70851a09abdca44f715f80d09e6d4b02203e04ba89e63255f6510d09e301' 
  AND token = '961ICDxrMmtwPnH6JsIvKD6ffXMIKQ3o9NnUJLhmRuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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