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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '84144693c9feed41c563385997f40aee0bf0fd01385ddb0d4d69e6b5b7c19261' 
  AND token = 'E8zYGc1Lsu2VqEZInFqW3jIO3Fu11bGb9t59rE14T5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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