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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d0987ad146472b7ee2d7afd0a553d29069c39c1d2d10c37f3d9e104e7694808' 
  AND token = 'GaFLvd7bcT2HtERpkPo4RcDzu4FdnKv9H2K6ferBdUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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