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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '236a595c7335a011b405a406c02900417a080a33d5afa43b5329265679fda655' 
  AND token = 'ddAOtWlytuAhSjsrSPmmPifuWbEP09Y85Kakz7P3kPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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