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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f2294b28b45a257c9ee255dc6b8aab2e51bfc0bed6aca86de17d4e2506c54b97' 
  AND token = 'LBgUC8L5h+i9e1ewTCp/05bVTBcj76wbpbP+GsskPhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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