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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e836799e1b0bd0f84bd5222f461d5d76d19bf5f889085d7984b70bc095c63e97' 
  AND token = 'o2o9bt5gLwUU9W+dqk3za7U+Fd8hi4i1cdTuPg1hW0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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