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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e37338067af15a379932c34f1c1a7b11b871cb8951a68904ca93797421ad3b64' 
  AND token = 'oC03Rf9/bs1lmsxUyel/MsLhQ14dyTbETo0eRVXG/1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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