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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a97dee651d9c241b7a671c98f1d62e85fafde29fbc9cf0bbeb81c6eeee3a2b20' 
  AND token = '5EshnU29aFf54SgyNbe+m2qK3rQI+8apX5rWY6uPmGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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