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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '905d8c71fdd12138615ce83c357b6bf5221b987e44fe414327a3e5a88a08c32b' 
  AND token = 'BoLr8nf332cZyzqmYFH6QkTVUE2u1tXS1ecB8RNX5Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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