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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '15999de0ca7a6c9c59fb9895560578a106f72326a818a413191ee6ebd02b0406' 
  AND token = '9ebkm1emT8N1lGFrkZLeztap6J6jJSiHWU3r/6Ycp+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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