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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8eed55f62da97e7c755aca687898bf4a83ee10d7bbcebab0c1e9f6bfbf7fd5ca' 
  AND token = 'AL0BkqwN4paIGuDPk1LwuVg5t6uTYfnpk+ElX1s3lM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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