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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '29cdab768e65a91f9aae5bf2aa1d87a4a73d15762de4f18287170c9f6ae85200' 
  AND token = 'VnNArWopfEvNy+gasl9vr4J7SRn5omGJRXiYNc3Ncew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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