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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1ac58dc2e191d375f9774f525dfb4d932b99b897563a97366bfe61847486553b' 
  AND token = '/5dhDohaXutTGv62DkKp3T+EFARorYOEIuuugtjide0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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