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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4e2775b92204a50b73de7fe8fe75fcd90aa76ca9512b7edb9e5e33b1ed365299' 
  AND token = 'U/zc2TLIc9V6Srg37MifEJHMxke1WUM7wkDXxxIg/ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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