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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3f0fa3afc0237a0c700b4f8fd57bd75e5d08b034d1d3bcf38eb1e99abdde7f64' 
  AND token = '+AB9auCUvvPUgjuBGg1LOWMb4TXuvHUqTOA3sAxGUck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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