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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f01871ab82b777e179091fd5954b8456f8288190e04bdc34bfdf2f65ed40eb9c' 
  AND token = '9meJypgJNAR9TZcRppKZtOj7pZNhJ7Gv1K9SvPHh2Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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